I think this may be like the long discussions we have had here about central heating - on twice a day or breakfast until bed-time - there will be differing opinions!
I have just done 390 miles in my 2 litre petrol Focus, of which something over 300 were done on motorways with the cruise set at 70 mph sat nav speed. I averaged 56 mph overall and got 39.8 mpg. That seems to good to me in any event but might I have got more (or less) without using cruise?
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